Savannah morning news. [volume] (Savannah) 1868-1887, 1887-03-21
POPULAR SCIENCE.

RottenstOne and olive oil made into a
thick paste is an excellent polish for mar
bic.
The magnetic power OF soft iron is more
than twice that of lodestOne and 1000
times that OF ferric sulphate.
To get the oil out Of a grndstone make
the stone as hot as safety will permit, and
then cover IL with a paste of whiting and
water. The mixture will soon become
filled with Oil, when it may be scraped Oft
and the process repeated until all the Oil
is extracted
TO harden wood pulleys: Soft maple is
often used in the construction of friction
pulleys. If it be boiled in olive oil it will
prove beneficial in number OF ways. 1t
viii harden the timber and render it less
liable to split, and at the same time the
gear Will slip more after such treatment.
When varnish, a few days subsequent
to having been laid on, loses its gloss IL is
said TO have 'clouded." This accident
seldom happens except in damp weather.
A Yarnish freshly spread and exposed to
damp air becomes covered by a mist
which leaves its mark upon it. This de-
feet may be remedIed by exposure to the
sun.
Equal parts of strong ammonia water,
ether and alcohol form a valuable clean
ing compound. Pass a piece of blotting
paper under the grease spot, mOisten a
sponge first with water to render it
greedy" then with the mixture, and
rHb the spot with 1t. In moment it is
dissolved, sapOnified and absorbed by the
sponge and blotter.
A wooden tank may be rendered capa-
BILE OF withstanding the effects OF nitric
or sulphuric acids by the following meth
DDS: Cover the inside with paraffine; 90
over the inside with a sadiron heated to
the temperature used in ironing clothes
melt the parafhne under the iron so as to
drive into the wood as much as possible
then with a cooler iron melt on a coat
thick enough to completely cover the
wood.
The Electric Review gives the following
method of cleaning brass: Make mix
ture OF one part common nitric acid and
one part sulphuric acid in stone jar;
| then place ready a pail Of fresh water
| and a box of sawdust, Dip the articles
TO be cleaned in the acid, then rinse them
in the water and alter ward rub them with
sawdust. This Immediately changes them
to a brilliant color. Ii the brass be greasy
1t must first be dipped in strong solu-
ton of caustic potash or soda. This cuts
the grease so that the acid has power to
act.
u6 WCAl-OOiOLCu al IlClth
OF bronze now seen in the market, show
ing all tints and adhering thorOu bly, to
the metal, are made by French process
which Is no longer a secret. The method
OF manufacture lies in tbeuse OF solutions
of sulphldes of antimony and arsenic,
which are applied to the bronze or brass
| articles. Alter thoroughly washing
| them with water they are thoroughly
dried, and then the sulphide solution is
| applied with brush. The best way is to
begin with dilute solution of ammonia,
giving one application. After drying,
the coating is brushed and then the dilute
solution OF sulphide OF arsenic in ammo
MIA is used, which produces yellow col
I or. The Oftener this sulphide OF arsenic
is applied the browner will be the color
and q deep tint may thus be finally OBJ
tanned. by solutions OF sulphide of anti
mony, either in ammonia or in sulpnide
Of ammonia, the tint is reddish and it is
possible in this way to obtain either the
most delicate red or the deepest dark red.
If some OF the parts of the article are
rubbed more strongly high metallic
lustre is obtained. Ammonia or sulphide
OF ammonia reabSOrbs the bronzing, and
In thls way defective spots may be i'm
proved. 1t is possible also TO use solu-
tons in csustic soda or potash, or the
sulphides OF either.